Nettys NioWorker Channel close

Question

I am trying to figure out why the below close function is being called in netty's(3.10.5) NioWorker. The full Class can be found here

        if (ret < 0 || failure) {
            k.cancel(); // Some JDK implementations run into an infinite loop without this.
            close(channel, succeededFuture(channel));
            return false;
        }

I am thinking there may be a couple of reasons like the host going down or host closing the channel after some time but I was thinking someone else who has worked with NioWorker might know better.

I have two different systems and this code is called a few time per day but the other system has like 100 per day with the same number of traffic. I am trying to find out why this might be the case.

Usually, in the Java networking world, a return value lower than 0 means EOF, this might be a clue for this question — Ferrybig, Apr 10 '18 at 07:34

score 0 · Answer 1 · answered Apr 12 '18 at 17:10

There are 2 conditions for when this function is called:

There was an error condition when reading from the channel, this is signalled by the failure variable
The channel has reached end of stream, this happens if the other sides closes the channel cleanly (ie, using the TCP FIN flag)

Nettys NioWorker Channel close

1 Answers1